The correct answer is B. Charayoli.
Charayoli is a fair held in the Indian state of Uttarakhand. It is held in the month of January or February, and is dedicated to the river God, Nanda Devi. The fair is attended by thousands of people, who come to offer prayers and sacrifices to the river God. One of the most important sacrifices that is offered at the fair is a male buffalo. The buffalo is sacrificed in order to appease the river God and to ensure a good harvest.
The other options are incorrect. Faag is a fair held in the Indian state of Bihar. It is held in the month of March, and is dedicated to the Hindu god, Shiva. Minjar is a fair held in the Indian state of Himachal Pradesh. It is held in the month of July, and is dedicated to the Hindu god, Vishnu. Gandhi is a fair held in the Indian state of Gujarat. It is held in the month of October, and is dedicated to the Indian independence leader, Mahatma Gandhi.